31603 is the Postal Code/PLZ Code for Diepenau in the Germany State of Lower Saxony and the District of Landkreis Nienburg (Weser).
| Postal Code | 31603 |
| Postal Code Name | Diepenau |
| State | Lower Saxony |
| District | Landkreis Nienburg (Weser) |
| Timezone | Central European Summer Time (CEST) |
| Adjacent Postal Codes | 31600 31606 32339 32369 32469 32479 49419 |